Question

A book rests on a table. The force of gravity pulls down on the book with a force of 20 newtons. What prevents the books from accelerating downward at 9.8 m/sec2

A) The table presses back up on the book with an equal and opposite force of 20 newtons.
B) The table and the book together are accelerating downwards at 9.8 m/sec2
C) The table presses back up on the book with a force greater than 20 newtons.
D) The inertia of the book holds it up

Answer 1

Answer:

A

Explanation:

the forces are balanced that's why book experiences no net force

Answer 2

Answer:

A

Explanation:

Action/Reaction force!

Book on table, table on book. This particular reaction force is called the Normal Force. The table doesn't push back with more force, or there would be an unbalanced positive force, causing the book to accelerate upward. The forces must be in equilibrium if the acceleration is 0 (rest)